Description
• Up to 256 I/O points per Master.
• Up to 32 Slaves per Master.
• Communications cycle time: 0.5 ms (at 750 kbps).
• Communications distance: Up to 500 m (at 93.75 kbps).
• Free wiring with any branching method for up to 200 m (in long-distance communications mode).
International Standards
- The standards are abbreviated as follows: U: UL, U1: UL (Class I Division 2 Products for Hazardous Locations), C: CSA, UC: cULus, UC1: cULus (Class I Division 2 Products for Hazardous Locations), CU: cUL, N: NK, L: Lloyd, and CE: EC Directives.
- Contact your OMRON representative for further details and applicable conditions for these standards.
| Unit type |
Name | Specifications | No. of unit numbers allocated |
Current con- sumption (A) |
Model | Stand- ards |
|||
|---|---|---|---|---|---|---|---|---|---|
| Communi- cations functions |
No. of I/O points |
Max. Units mountable per CPU Unit |
5 V | 24 V | |||||
| CJ1 Special I/O Units |
CompoBus/S Master Unit  |
Remote I/O communi- cations |
256 max. (128 inputs and 128 outputs) |
40 | 1 or 2 (variable) |
0.15 | — | CJ1W-SRM21 | UC1, N, L, CE, |
| 128 max. (64 inputs and 64 outputs) |
|||||||||
Note: This unit cannot be used with the Machine Automation Controller NJ-series.
Communication Specifications
| Item | Specification | |
|---|---|---|
| Communications method | Special CompoBus/S protocol | |
| Communications baud rate | High-speed Communications Mode: 750 kbps Long-distance Communications Mode: 93.75 kbps |
|
| Modulation method | Baseband method | |
| Coding method | Manchester coding method | |
| Error control checks | Manchester code check, frame length check, and parity check | |
| Cable | VCTF cable (JIS C 3306) |
Two 0.75 mm2 conductors (2 signal wires) Four 0.75 mm2 conductors (2 signal wires and 2 power supply wires) |
| Special Flat Cable |
Four 0.75 mm2 conductors (2 signal wires and 2 power supply wires) | |
| Commu- nications distance |
2-conductor VCTF cable |
High-speed Communications Mode Main line length: 100 m max. Branch line length: 3 m max. Total branch line length: 50 m max. |
| Long-distance Communications Mode Main line length: 500 m max. Branch line length: 6 m max. Total branch line length: 120 m max. |
||
| 4-conductor VCTF cable |
High-speed Communications Mode Main line length: 30 m max. Branch line length: 3 m max. Total branch line length: 30 m max. |
|
| Long-distance Communications Mode: Flexibly branched, provided that the total length of cable is a maximum of 200 m. |
||
| Special Flat Cable |
High-speed Communications Mode Main line length: 30 m max. Branch line length: 3 m max. Total branch line length: 30 m max. When 4-conductor VCTF cable or Special Flat Cable is used to connect fewer than 16 Slaves, the main line can be up to 100 m long and the total branch line length can be up to 50 m in High-speed Communications Mode. |
|
| Long-distance Communications Mode: Flexibly branched, provided that the total length of cable is a maximum of 200 m. |
||
Specifications
| I/O points | 256 (128 inputs and 128 outputs) or 128 (64 inputs and 64 outputs) (Switch- selectable) |
|---|---|
| Applicable PLC models | CJ-series PLCs |
| Unit type | Special I/O Unit |
| Allocated words * | For 256 I/O: 20 words (8 for inputs, 8 for outputs, 4 for status) For 128 I/O: 10 words (4 for inputs, 4 for outputs, 2 for status) |
| No. of mountable Master Units | 40 |
| Node address | 8 addresses per node |
| No. of connectable Slaves | 32 |
| Status information | Communications Error Flags, Participation Flags |
* Uses Special I/O Unit Area (in CIO Area).
(Unit: mm)
CJ1W-SRM21
|
Catalog Name
|
Catalog Number
[size] |
Last Update
|
|---|---|---|
 CJ1W-SRM21 Data Sheet |
– [515KB] |
Sep 15, 2016 |
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